Mueller's office did not immediately comment on the sentence.
Papadopoulos apparently raised the possibility of setting up a meeting between Trump and Putin during a national security meeting in March 2016. "I can't guarantee. All I can say is, my memory is telling me that I never shared it with anyone on the campaign".
Trump has denied knowing anything about contact with Russians and his campaign. "It was at best, begrudging efforts to cooperate". The 31-year-old, who was also ordered to pay a $9,500 fine and perform community service, is the first person to be sentenced in special counsel Robert Mueller's probe into Russian Federation election interference.
In his pre-sentencing statement, Papadopoulos admitted lying to FBI investigators in January 2017 but said it had been out of a desire to protect his career and a naive loyalty to the Trump administration.
31 year-old George Papadopoulos told a sentencing hearing in Washington DC that he was a "patriotic American" who made a mistake by lying.
"I was surrounded by important people", he told the judge. "He was very fair", Kiki Papadopoulos said. I don't know him.
The White House distanced itself from Papadopoulos, referring to his campaign role as nothing more than a low-level coffee boy, after his guilty plea.
"So everybody said if you only listened to your mother none of this would have happened", she said.
Lawyers for Mr. Papadopoulos dispute some of the government's characterizations, and they asked the judge to sentence him to probation.
Van der Zwaan, a Dutch lawyer who worked with Manafort and Gates, was also convicted of lying to prosecutors. His lawyers asked U.S. District Judge Randolph Moss for a sentence of probation that would terminate immediately, saying he's been under close supervision for 13 months and cooperated with the government.
Moss said he thought Papadopoulos' remorse was genuine.
Van der Zwaan was sentenced to 30 days in a Pennsylvania prison and received a $20,000 fine.
Outside court on Friday, Papadopoulos' lawyer, Thomas Breen, said his client was a "fool" and had acted "stupidly" in lying to the Federal Bureau of Investigation.
Papadopoulos soon made contact with a mysterious Maltese academic, Joseph Mifsud.
"The message is for all of us to check our loyalty, to tell the truth, to help the good guys", Breen said.
He was also the first to detail a member of the Trump campaign having knowledge of the Russian efforts to meddle while it was going on.
Giving evidence to the Federal Bureau of Investigation on 27 January 2017 in the case of RF interference in American elections, Papadopoulos said his meeting in March 2016 with a London Professor, who had connections with the Russian officials, was held before he was appointed adviser to the campaign.
In late April, he also told them that Mifsud said the Russians had information that could harm Clinton, in the form of thousands of emails. A scheduled Federal Bureau of Investigation cooperation interview was canceled. They noted that he and his wife appeared frequently in the media to discuss the case.
Former Trump campaign adviser George Papadopoulos says he doesn't remember telling anyone on the campaign that Russian Federation had damaging emails about Hillary Clinton, but "can't guarantee" that he kept the bombshell from his campaign colleagues. When they came to light, they triggered the investigation that has loomed over the first two years of Trump's presidency. Last November, Mr Sessions testified to Congress that he had "pushed back" against Papadopoulos' offer.